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https://issues.apache.org/jira/browse/HADOOP-8659?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Trevor Robinson updated HADOOP-8659:
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Status: Patch Available (was: Open)
> Native libraries must build with soft-float ABI for Oracle JVM on ARM
> ---------------------------------------------------------------------
>
> Key: HADOOP-8659
> URL: https://issues.apache.org/jira/browse/HADOOP-8659
> Project: Hadoop Common
> Issue Type: Bug
> Components: native
> Environment: armhf Linux with Oracle JVM
> Reporter: Trevor Robinson
> Assignee: Trevor Robinson
> Attachments: HADOOP-8659.patch, HADOOP-8659.patch, HADOOP-8659.patch
>
>
> There was recently an ABI (application binary interface) change in most Linux
> distributions for modern ARM processors (ARMv7). Historically, hardware
> floating-point (FP) support was optional/vendor-specific for ARM processors,
> so for software compatibility, the default ABI required that processors with
> FP units copy FP arguments into integer registers (or memory) when calling a
> shared library function. Now that hardware floating-point has been
> standardized for some time, Linux distributions such as Ubuntu 12.04 have
> changed the default ABI to leave FP arguments in FP registers, since this can
> significantly improve performance for FP libraries.
> Unfortunately, Oracle has not yet released a JVM (as of 7u4) that supports
> the new ABI, presumably since this involves some non-trivial changes to
> components like JNI. While the soft-float JVM can run on systems with
> multi-arch support (currently Debian/Ubuntu) using compatibility libraries,
> this configuration requires that any third-party JNI libraries also be
> compiled using the soft-float ABI. Since hard-float systems default to
> compiling for hard-float, an extra argument to GCC (and installation of a
> compatibility library) is required to build soft-float Hadoop native
> libraries that work with the Oracle JVM.
> Note that OpenJDK on hard-float systems does use the new ABI, and expects JNI
> libraries to use it as well. Therefore the fix for this issue requires
> detecting the float ABI of the current JVM.
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